Big unis

What are the biggest unicycles people have seen ridden, or perhaps ridden
themselves? At the Edinburgh festival there were a couple of buckers:

An australian guy who rode a 10 foot DM giraffe whilst juggle 2 knifes and an
apple. (Guess what he did with that)

An english bloke from Chester who rode ladder converted into a unicycle. With
the wheel it must have been about 11’ high. It had a brake which initially
confused me, until I realized that’s how he gets on: locks the brake, climbs the
ladder (against a lamppost), frees the brake and rides. Apparently his design is
protected by law!